Which relation is a function?
A.

(5, –2), (4, 6), (–3, –2), (0, 4)
B.

(–1, –2), (3, –5), (–1, –5), (2, –2)
C.

(4, 3), (3, 2), (–1, 5), (4, 0)
D.

(–4, –4), (3, –3), (–4, 4), (–3, 3)

Question

Which relation is a function?
A.
	
(5, –2), (4, 6), (–3, –2), (0, 4)
B.
	
(–1, –2), (3, –5), (–1, –5), (2, –2)
C.
	
(4, 3), (3, 2), (–1, 5), (4, 0)
D.
	
(–4, –4), (3, –3), (–4, 4), (–3, 3)

johnweldon1993 · Answer

What you have are pairs of coordinates...for a relation to be a function...each 'x' value cannot have more that 1 'y' value....

so for example...if you have (0 , 1) and (0 , 2)    this is NOT a function...because the 'x' (0) appears twice...and it have 2 different 'y' values (1 and 2)    so which of your relations do not have repeating 'x' values?